Abstract

The adduct between <i>IF</i>₇ and <i>AsF</i>₅ has been shown to be ionic and consist of IF₆⁺ and AsF₆⁻ ions. The environment of these ions appears to be octahedral. Based on this symmetry, force constants have been determined. Some controversy regarding the frequency position of the ν₄ (<i>F</i>_1<i>u</i>) vibration, and the assignment for the ν₁ (<i>A</i>_1<i>g</i>), ν₂ (<i>E</i>_g) vibrations in <i>IF</i>₆⁺ has existed. However, the proper ν₄ assignment was eventually made, and Raman studies of <i>IF</i>₆⁺<i>AsF</i>₆⁻ in <i>HF</i> solutions clearly indicated that the lower frequency band at 711 cm⁻¹ was polarized. Thus, the depolarized 732 cm⁻¹ vibration was assigned as the ν₂ (<i>Eg</i>) mode. Recently, <i>IF</i>₆⁺<i>SbF</i>₆⁻ has been prepared and the vibration spectrum analyzed. The results support previous assignments of Christe and Sawodny and verify the ν₄ assignment.

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